WO2007009379A1 - Procede pour la reduction de teneur en carbonates dans le chemin d'ecoulement de production d'alumine - Google Patents

Procede pour la reduction de teneur en carbonates dans le chemin d'ecoulement de production d'alumine Download PDF

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Publication number
WO2007009379A1
WO2007009379A1 PCT/CN2006/001745 CN2006001745W WO2007009379A1 WO 2007009379 A1 WO2007009379 A1 WO 2007009379A1 CN 2006001745 W CN2006001745 W CN 2006001745W WO 2007009379 A1 WO2007009379 A1 WO 2007009379A1
Authority
WO
WIPO (PCT)
Prior art keywords
lime
content
alumina
carbonate
alkali
Prior art date
Application number
PCT/CN2006/001745
Other languages
English (en)
Chinese (zh)
Inventor
De Chen
Original Assignee
China Aluminum International Engineering Corporation Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Aluminum International Engineering Corporation Limited filed Critical China Aluminum International Engineering Corporation Limited
Publication of WO2007009379A1 publication Critical patent/WO2007009379A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
    • C01F7/0606—Making-up the alkali hydroxide solution from recycled spent liquor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Definitions

  • the invention relates to an alumina production process, which is used for a lime burning process in an alumina plant raw material workshop and an alkali replenishing process in an evaporation plant.
  • the sodium carbonate in the process is continuously accumulated. After each Bayer cycle process, the sodium carbonate in the process accumulates a part of the increase, and the increase of the sodium carbonate content has many adverse effects on the production. Therefore, there are salt causticizing processes in production.
  • the function of the salt causticization process is to precipitate sodium carbonate in the evaporation mother liquor from the solution, and convert the sodium carbonate into caustic soda by lime causticization, and recycle the causticized solution back to the process.
  • the sodium carbonate in the process is mainly brought in by the following four routes:
  • Bauxite is brought into C0 2 : Bauxite usually contains a small amount of dolomite and other minerals containing co 2 , and the ore is added to the raw mill to grind, and the co 2 in the ore enters the process.
  • the air contains C0 2 , and the C0 2 is in contact with the sodium aluminate solution for a long time, and a small portion of the NaOH in the sodium aluminate solution is converted into Na 2 C0 3 , so that the C0 2 in the air enters the process.
  • these co 2 into the process are in the form of sodium carbonate in the process of accumulation, resulting in high flow of sodium carbonate, adversely affect the production of alumina.
  • the conversion of caustic soda to Na 2 C0 3 is detrimental to alumina production.
  • Sodium carbonate is an ineffective base that circulates in the process and adversely affects alumina production, such as causing sodium aluminate solution.
  • Increased viscosity, unfavorable for the production of sand-like alumina products, precipitation during the dissolution and evaporation process to form sodium carbonate crucibles, blockage of pipes, valves, adhesion to heat transfer The surface of the device reduces its heat transfer coefficient, affecting the normal operation of the heat exchanger.
  • the co 2 in the process is mainly brought into the production process through four ways, in which the co 2 in the bauxite is determined by the characteristics of the ore itself, and the co 2 in the air is inevitable, in the current technical conditions. Next, these two factors are unchangeable. In fact, these two factors is not much flow into C0 2 is usually only about 30% and ⁇ 02 a greater amount of additional factors into two processes, i.e., a base of lime and complement factors, usually It accounts for about 70%, and these two factors can be improved.
  • the present invention proposes a new process to reduce the concentration of carbonate in the solution.
  • the object of the present invention is to: use a new process to reduce the carbonate content of the process and eliminate the adverse effects of carbonate on the process.
  • the invention is realized by: converting the lime in the alumina furnace to the lime in the rotary kiln, and the C0 2 content in the lime is 2 to 3%; canceling the existing sintering method to the Bayer process , using NaOH > 42% liquid caustic to the base method of the Bayer process.
  • the base of the Bayer process uses the seed system of the sintering system. Because of the high content of impurities such as sodium carbonate and sodium sulfate in the mother liquor of the sintering method, the alkali method will use a large amount of carbon.
  • the acid salt is brought into the Bayer process.
  • the invention converts it into a Bayer process system to supplement the liquid caustic soda by NaOH > 42%, and does not use the sintering method to separate the mother liquor to supplement the alkali, thereby eliminating the influence of the carbonate in the mother liquor of the sintering method on the Bayer system.
  • the beneficial effects of the invention are as follows: the carbonate content in the process is reduced, the adverse effect of the carbonate on the process is eliminated, and the working efficiency of the heat exchanger is improved.
  • Embodiments of the present invention The existing shaft furnace fired lime in the alumina plant is changed into rotary kiln burnt lime, the lime burned in the rotary kiln is good in quality, and the lime content in the co 2 is low; for the combined alumina plant, Bayer The system system uses alkali hydroxide with NaOH > 42%, and does not use the seed system of the sintering system to supplement the alkali. By adopting these two measures, the Co 2 process brings in co 2 Can be greatly reduced.
  • the lime burning process of the alumina plant is currently disposed in the raw material workshop of the alumina plant. From the perspective of environmental protection, the lime burning process can be arranged in the alumina plant by using the rotary kiln to burn lime, or the lime can be fired. The process is arranged in a limestone mine, and the burnt lime is transported into the alumina plant by a car for use in an alumina plant.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

La présente invention a trait à un procédé pour la réduction de teneur en carbonates dans le chemin d'écoulement de production d'alumine, comprenant la substitution du four droit par un four rotatif pour la calcination de la chaux dans la production d'oxyde d'alumine, dans lequel la teneur en dioxyde de carbone dans la chaux est de 2∩3 %. A la place du procédé de frittage courant pour la procédure de supplément d'alcali de procédé Bayer, il utilise l'alcali caustique liquide contenant du NaOH ≥ 42 % pour le supplément d'alcali dans le système de procédé Bayer. Le procédé peut réduire la teneur en carbonate dans le traitement, ce qui permet d'éliminer l'effet négatif du carbonate et améliorer l'efficacité de l'échangeur thermique.
PCT/CN2006/001745 2005-07-18 2006-07-18 Procede pour la reduction de teneur en carbonates dans le chemin d'ecoulement de production d'alumine WO2007009379A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200510200400.8 2005-07-18
CNB2005102004008A CN100345759C (zh) 2005-07-18 2005-07-18 氧化铝生产过程中降低流程中碳酸盐的方法

Publications (1)

Publication Number Publication Date
WO2007009379A1 true WO2007009379A1 (fr) 2007-01-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2006/001745 WO2007009379A1 (fr) 2005-07-18 2006-07-18 Procede pour la reduction de teneur en carbonates dans le chemin d'ecoulement de production d'alumine

Country Status (2)

Country Link
CN (1) CN100345759C (fr)
WO (1) WO2007009379A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111252790A (zh) * 2020-03-16 2020-06-09 中国铝业股份有限公司 一种拜耳法高碳碱溶液蒸发和析盐工艺改进的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104591242B (zh) * 2015-02-04 2016-02-17 河北科技大学 一种中低品位铝土矿低钙铝比石灰烧结制备熟料的方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4451443A (en) * 1982-07-28 1984-05-29 Aluminum Company Of America Causticization method
JPH08175817A (ja) * 1994-12-27 1996-07-09 Sumitomo Chem Co Ltd カルシウムアルミネート水和物およびこれを用いた水酸化アルミニウムの製造方法
CN1389400A (zh) * 2002-07-23 2003-01-08 中国铝业股份有限公司 一种氧化铝生产过程中补碱的方法
CN1405088A (zh) * 2002-11-12 2003-03-26 中国铝业股份有限公司 一种生产氧化铝工艺过程的补碱方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4451443A (en) * 1982-07-28 1984-05-29 Aluminum Company Of America Causticization method
JPH08175817A (ja) * 1994-12-27 1996-07-09 Sumitomo Chem Co Ltd カルシウムアルミネート水和物およびこれを用いた水酸化アルミニウムの製造方法
CN1389400A (zh) * 2002-07-23 2003-01-08 中国铝业股份有限公司 一种氧化铝生产过程中补碱的方法
CN1405088A (zh) * 2002-11-12 2003-03-26 中国铝业股份有限公司 一种生产氧化铝工艺过程的补碱方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111252790A (zh) * 2020-03-16 2020-06-09 中国铝业股份有限公司 一种拜耳法高碳碱溶液蒸发和析盐工艺改进的方法

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CN1730394A (zh) 2006-02-08
CN100345759C (zh) 2007-10-31

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